Improvement in block-frames



J. W. N 0 RCR OSS. BLOCK-FRAME'.

Patented June 27. 1875.

' YINVENTOB;

WITNESSESI UNITED A JOSEPH W. NORCROSS, OFl BOSTON, MASSACHUSETTS.

IMPROVEMENT IN BLOCK-FRAMES.

Specication forming part of Letters Patent No. 179,126, dated J une 27, 1876; application iled March 18, 1876.

To all whom it may concern:

Be it known that I, JOSEPH W. Nononoss, of the city of Boston, county of Suffolk, and State of Massachusetts, have invented certain new and useful Improvements in Blocln Frames; and I hereby declare that the following is a clear, full, and exact description of the same, reference being had to the accompanying drawings, forming part of this speciilcation.

Figure l is a perspective view of my improved block-frame, as made for a single block. Fig. 2 is an end view of my improved double block-frame. Fig. 3 is a partial section of the side frame and through a: 0o. Fig. 4 is a partial sectionV of the partition-frame in a double block through y y.

The object ot' this invention is to produce a block-frame of malleable iron, or any other suitable metal, that shall be stronger, cheaper, and better than block-frames as heretofore constructed; .that shall present on all sides a smooth, roundedl surface 5 shall Vhave no straps or other projections liable to injure the masts, wood-work, or other portion of a vessel, and have all the advantages of a lignum-vitae or egg-shaped block.l

It consists in the peculiar arrangement of its parts and in the manner in which the same are cast or otherwise constructed, as will be more fully set forth hereinafter. y

In the drawings, a a are the frames proper. They are cast in malleable iron or other suitable metal. All the surfaces, as, also, the edges, are perfectly smooth and rounded, so that no part can scratch or injure anything with which the block may come in contact. bis the rounded edge, perfectly smooth and turned in on the inner side,'so as to form a recess, into part of which the sheave enters, so that Vthe rounded edges b b form a guide for the rope and more eft'ectually keep the sarnecentrahon the sheave. c is the central partition-frame, provided with a rounded edge, as shown in Fig. 4. This partition is also used in triple or quadruple blocks. cl d are the studs which separate the frames the proper distance. These studs are cast on each part of the frames, as shown inthe drawings, and through one ot' them the pin E passes, which, when riveted, secures thet frames together. E E are pins or projections. They are usually part of either the central or one of the side frames of the block, and are cast in malleable iron or other suitable metal. These pins may be made of wrought iron and cast into the frame, or in a single block. One side of the frame may be ca st with the pins E and placed in the sand. A pattern like the other side may be placed on this, provided with holes for the pins to pass into, and, When rammed up and parted, the second vside may be at once cast onto the pins, and the whole block-frame be so completed with-r out riveting.

If required, the eye-hook may be placed, also, into the sand, and so the Whole conlpleted at one operation.

In a double block the pins are cast onto the central frame o projecting on each side, and may be cast into the side frames, as before described, or be riveted to the same.

' f f are the bosses in which the sheavespindle is secured. They are, therefore, cast with the hole g to receivethe spindle. The bosses f f project above the inner surface of the block-frames, and thus prevent the friction caused by the sheave when in contact with the sides. Thel sheaves will, therefore, turn with the least possible friction.

Vhen cast of malleable iron and prop- Y erly annealed, these block-frames are superior to thebest lignumvitae blocks. They are strong, light, cheap, and durable. They' have no straps or other projecting parts. They can injure no part of a vessel, and will pass freely along and between ropes or sails without injury.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a cast-metal block-frame, the frame a proper, having the rounded edge b,for1n ing a rounded corner on the outside and a recess on the inside of the frame, as and for the purpose set forth.

2. The combination, with the frames a a, provided with the rounded edges, of the pins E E, cast onto one part of the frame, and riveted to the other, substantially as and for the purpose set forth.

3. The method, substantially as herein described, of casting the outer frameonio 4the inner frame or to the other outer frame, Y and around the projecting' pins, as and for the purpose set forth, so as to produce a complete single or double block fr-.une Without riveting.

. JOSEPH W. NORGROSS. Witnesses:

JOSEPH A. MILLER,

JOSEPH A. MILLER, Jr. 

